Longitudinal phase space tomography at J-PARC RCS

Yoshimoto, Masahiro  ; Tamura, Fumihiko   ; Yamamoto, Masanobu   ; Yoshii, Masahito*; Hayashi, Naoki  ; Kawase, Masato; Watanabe, Kazuhiko*; Yoshikawa, Hirokazu*

The longitudinal phase space tomography, which was evolved to retrieve the two-dimensional beam distribution in the longitudinal phase space with computer tomography algorithms, is very useful diagnostic tool in the accelerator domain. The simple reconstruction tool was developed for the J-PARC RCS with the convolution back projection method for the beam storage mode. On the assumption that the longitudinal profiles should not be disturbed for one period of the synchrotron oscillation, such two-dimensional profiles can be reconstructed easily from one-dimensional bunch beam profiles, which are measured for every turn by the wall current monitor.